VOKERA UNICA i28 Operating instructions
- Category
- Water heaters & boilers
- Type
- Operating instructions
This manual is also suitable for
Users Instructions
Installation &
Servicing
Instructions
THESE INSTRUCTIONS
TO BE RETAINED
BY USER
Vokèra is a licensed member of the Benchmark scheme
which aims to improve the standards of installation and
commissioning of domestic hot water systems in the UK.
Unica i28 - i32
High eciency combi boiler
G.C. NUMBER
Unica i28 47 364 14
Unica i32 47 364 15
Users instructions
1. THINGS YOU SHOULD KNOW ............................................1
1.1 GAS APPLIANCES ................................................................1
1.2 ELECTRICAL SUPPLY ..........................................................1
1.3 GUARANTEE REGISTRATION CARD ..................................1
1.4 APPLIANCE COMMISSIONING CHECKLIST (UK only) ....... 1
1.5 HOW DOES IT WORK? .........................................................1
1.6 DIMENSIONS.........................................................................1
1.7 CLEARANCES REQUIRED ................................................... 1
1.8 FROST PROTECTION SYSTEM ........................................... 1
1.9 APPLIANCE STATUS INDICATORS ...................................... 1
2. GETTING STARTED .............................................................. 3
2.1 BEFORE SWITCHING ON .....................................................3
2.2 APPLIANCE CONTROLS .....................................................3
2.3 LIGHTING THE BOILER ........................................................ 3
2.4 ADJUSTING THE HEATING TEMPERATURE ...................... 3
2.5 ADJUSTING THE HOT WATER TEMPERATURE ................. 3
2.6 EXPLANATION OF FEATURES ............................................ 3
2.7 AUTOMATIC TEMPERATURE CONTROL ............................3
3. HOW TO... ..............................................................................4
3.1 HOW TO TOP-UP THE SYSTEM PRESSURE ..................... 4
3.2 HOW TO RESET THE APPLIANCE ....................................... 4
3.3 HOW TO SHUT DOWN THE SYSTEM
FOR SHORT PERIODS .........................................................4
3.4 HOW TO SHUT DOWN THE SYSTEM
FOR LONG PERIODS ..........................................................4
3.5 HOW TO CARE FOR THE APPLIANCE ............................... 4
4. WHAT IF... ..............................................................................4
4.1 WHAT IF I SUSPECT A GAS LEAK ....................................... 4
4.2 WHAT IF I HAVE FREQUENTLY
TO TOP-UP THE SYSTEM .................................................... 4
4.3 WHAT IF THE APPLIANCE IS DUE
ITS ANNUAL SERVICE ......................................................... 4
4.4 WHAT IF I NEED TO CALL AN ENGINEER........................... 4
Installation and servicing instructions
SECTION 1 - DESIGN PRINCIPLES AND OPERATING SE-
QUENCE .......................................................................................6
1.1 PRINCIPLE COMPONENTS..................................................6
1.2 MODE OF OPERATION (at rest) ...........................................6
1.3 MODE OF OPERATION (Heating) .........................................6
1.4 MODE OF OPERATION (Hot water) ......................................6
1.5 SAFETY DEVICES .................................................................6
SECTION 2 - TECHNICAL DATA ....................................................7
2.1 CENTRAL HEATING .............................................................. 7
2.2 DOMESTIC HOT WATER ...................................................... 7
2.3 GAS PRESSURES.................................................................7
2.4 EXPANSION VESSEL ............................................................ 7
2.5 DIMENSIONS.........................................................................7
2.6 CLEARANCES ....................................................................... 7
2.7 CONNECTIONS .....................................................................7
2.8 ELECTRICAL .........................................................................7
2.9 FLUE DETAILS (CONCENTRIC 60-100) ...............................7
2.9A FLUE DETAILS (CONCENTRIC 80-125) ...............................7
2.9B FLUE DETAILS (TWIN PIPES) ..............................................7
2.10 EFFICIENCY ..........................................................................7
2.11 EMISSIONS ...........................................................................7
2.12 PUMP DUTY ..........................................................................9
SECTION 3 - GENERAL REQUIREMENTS (UK) .........................10
3.1 RELATED DOCUMENTS .....................................................10
3.2 LOCATION OF APPLIANCE ................................................ 10
3.3 GAS SUPPLY ....................................................................... 10
3.4 FLUE SYSTEM ....................................................................10
3.5 AIR SUPPLY ........................................................................10
3.6 WATER CIRCULATION ........................................................ 10
3.7 ELECTRICAL SUPPLY ........................................................ 11
3.8 MOUNTING ON A COMBUSTIBLE SURFACE .................... 11
3.9 TIMBER FRAMED BUILDINGS ........................................... 11
3.10 INHIBITORS ......................................................................... 11
3.11 SHOWERS ........................................................................... 11
SECTION 3A - GENERAL REQUIREMENTS (EIRE) .................... 11
3A.1 RELATED DOCUMENTS ..................................................... 11
3A.2 LOCATION OF APPLIANCE ................................................ 11
3A.3 GAS SUPPLY ....................................................................... 12
3A.4 FLUE SYSTEM ....................................................................12
3A.5 AIR SUPPLY ........................................................................12
3A.6 WATER CIRCULATION ........................................................ 12
3A.7 ELECTRICAL SUPPLY ........................................................12
3A.8 MOUNTING ON A COMBUSTIBLE SURFACE ....................12
3A.9 TIMBER FRAMED BUILDINGS ...........................................12
3A.10 INHIBITORS ......................................................................... 12
3A.11 SHOWERS ...........................................................................12
3A.12 DECLARATION OF CONFORMITY ..................................... 12
SECTION 4 - INSTALLATION .......................................................13
4.1 DELIVERY ..........................................................................13
4.2 CONTENTS ..........................................................................13
4.3 UNPACKING ........................................................................13
4.4 PREPARATION FOR MOUNTING THE APPLIANCE .......... 13
4.5 FITTING THE FLUE ............................................................. 14
4.6 CONNECTING THE GAS AND WATER .............................. 18
4.7 ELECTRICAL CONNECTIONS ............................................ 18
SECTION 5 - COMMISSIONING ...................................................19
5.1 GAS SUPPLY INSTALLATION ............................................. 19
5.2 THE HEATING SYSTEM ......................................................19
5.3 FILL THE CONDENSATE TRAP .......................................... 19
5.4 INITIAL FILLING OF THE SYSTEM .....................................19
5.5 INITIAL FLUSHING OF THE SYSTEM ................................19
5.6 PRE-OPERATION CHECKS ................................................19
5.7 INITIAL LIGHTING ...............................................................19
5.8 CHECKING GAS PRESSURE
AND COMBUSTION ANALYSIS .......................................... 19
5.9 FINAL FLUSHING OF THE HEATING SYSTEM ................. 19
5.10 SETTING THE BOILER OPERATING TEMPERATURE ...... 19
5.11 SETTING THE SYSTEM DESIGN PRESSURE ..................19
5.12 REGULATING THE CENTRAL HEATING SYSTEM ............ 19
5.13 FINAL CHECKS ...................................................................20
5.14 INSTRUCTING THE USER ..................................................20
SECTION 6 - SERVICING INSTRUCTIONS ..................................20
6.1 GENERAL ............................................................................20
6.2 ROUTINE ANNUAL SERVICING ......................................... 20
6.3 REPLACEMENT OF COMPONENTS ..................................20
6.4 COMPONENT REMOVAL PROCEDURE ............................ 20
6.5 PUMP ASSEMBLY .............................................................. 21
6.6 SAFETY VALVE .................................................................. 21
6.7 LOWER AUTOMATIC AIR RELEASE VALVE ..................... 21
6.8 WATER PRESSURE SWITCH ............................................ 21
6.9 FLOW THERMISTOR ......................................................... 21
6.10 RETURN THERMISTOR ..................................................... 21
6.11 PRINTED CIRCUIT BOARD ...............................................21
6.12 GAS VALVE .........................................................................22
6.13 ELECTRODES & CONDENSE SENSOR ............................ 22
6.14 AIR PRESSURE SWITCH REMOVAL ................................ 22
6.15 FLUE FAN & MIXER ........................................................... 22
6.16 BURNER .............................................................................22
6.17 MAIN HEAT EXCHANGER .................................................23
6.18 AUTOMATIC BY-PASS & DHW NON-RETURN VALVE ..... 23
6.19 EXPANSION VESSEL REMOVAL .......................................23
6.20 CONDENSE TRAP REMOVAL ...........................................23
6.21 FLUE COLLECTOR REMOVAL .......................................... 24
SECTION 7 - CHECKS, ADJUSTMENTS AND FAULT FINDING 25
7.1 CHECKING APPLIANCE OPERATION ............................... 25
7.2 APPLIANCE MODES OF OPERATION ............................... 25
7.3 CHECKING THE CO2 AND
ADJUSTING THE GAS VALVE ............................................ 25
7.4 COMBUSTION ANALYSIS TEST .........................................26
7.5 CHECKING THE EXPANSION VESSEL ..............................26
7.6 EXTERNAL FAULTS ............................................................26
7.7 ELECTRICAL CHECKS .......................................................26
7.8 FAULT FINDING ...................................................................27
7.9 COMPONENT VALUES & CHARACTERISTICS ................. 27
7.10 ADJUSTMENTS ...................................................................28
7.11 ALARM RECORDS .............................................................. 30
SECTION 8 - WIRING DIAGRAMS ...............................................31
8.1 EXTERNAL WIRING ............................................................31
8.2 TYPICAL CONTROL APPLICATIONS .................................31
8.3 OTHER DEVICES ................................................................ 31
SECTION 9 - LPG INSTRUCTIONS .............................................. 33
9.1 RELATED DOCUMENTS .....................................................33
9.2 TECHNICAL DATA ...............................................................33
9.3 CONVERTING THE APPLIANCE GAS TYPE ..................... 33
9.4 GAS SUPPLY ....................................................................... 33
9.5 GAS SUPPLY INSTALLATION ............................................. 33
9.6 CHECKING THE CO2 AND
ADJUSTING THE GAS VALVE ............................................ 33
Commissioning checklist ........................................................... 34
Benchmark .............................................................................. 35-38
Warranty Terms && Conditions .................................................. 39
1
USERS INSTRUCTIONS
1.1 GAS APPLIANCES
Gas Safety (Installation and Use) Regulation (UK).
In the interests of your safety and that of others it is a legal
requirement that all gas appliances are installed and correctly
maintained by a competent person and in accordance with the
latest regulations.
1.2 ELECTRICAL SUPPLY
Please ensure that this appliance has been properly connected
to the electrical supply by means of a double pole isolator or
un-switched socket, and that the correct size of fuse (3 AMP)
has been tted.
Warning: this appliance must be earthed!
1.3 GUARANTEE REGISTRATION CARD
Please take the time to ll out your guarantee registration card.
The completed warranty card should be posted within 30 days
of installation.
1.4 APPLIANCE COMMISSIONING CHECKLIST
(UK only)
A checklist section can be found at the rear of the appliance
installation booklet. This important document must be com-
pleted during the installation/commissioning of your boiler. All
GAS SAFE registered installers carry a GAS SAFE ID card,
and have a registration number. These details should be re-
corded in the Benchmark commissioning checklist section
within the installation booklet. You can check your installers
details by calling GAS SAFE direct on 08004085500. Failure
to install and commission the appliance in accordance with
the manufacturers instructions will invalidate the warranty.
This does not aect your statutory rights.
1.5 HOW DOES IT WORK?
Your Unica boiler supplies heated water to your radiators and
hot water to your hot water taps. The central heating is con-
trolled via a time clock and any thermostats that your installer
may have tted. The boiler will light when it receives a request
from the time clock via any thermostat that may be installed,
or whenever a hot water outlet (tap) is opened. Your Unica
boiler lights electronically and does not have a pilot light.
In the unlikely event of a fault developing with your boiler, the
supply of gas to the burner will be terminated automatically.
Dear Customer
Your Vokèra Unica boiler has been designed to meet and exceed the very latest standards in gas central heating technology,
and if cared for, will give years of reliable use and eciency. Please therefore take some time to read these instructions carefully.
Do’s and Don’t’s
- Do ensure that the system pressure is periodically checked
- Do ensure that the boiler should not be used by children or unassisted disabled people
- Do ensure that you know how to isolate the appliance in an emergency
- Do ensure that you are familiar with the appliance controls
- Do ensure that your installer has completed the appliance log book section
- Do not attempt to remove the appliance casing or gain internal access
- Do not hang clothes etc. over the appliance
- Do not forget to have the appliance serviced annually.
INTRODUCTION
1.6 DIMENSIONS
1.7 CLEARANCES REQUIRED
1.8 FROST PROTECTION SYSTEM
The Unica is equipped with a built-in frost protection system,
this enables the boiler to over-ride the time controls – even if
switched o – and operate the burner and/or pump, should
the temperature drop below 5
0
C for the main and for the DHW
line. In particular the burner will be in ON status until the main
temperature reaches 35°C for CH appliance and 55°C for
DHW appliance. Please note that the frost protection system
is designed to protect the appliance only, should frost protec-
tion be required for the heating system, additional controls
may be required.
NOTE
The frost protection system is reliant on the appliance having a
permanent electrical supply, and being in a non-fault condition.
1.9 APPLIANCE STATUS INDICATORS
Your boiler is equipped with a large LCD display that indicates
the appliance operating status.
1. THINGS YOU SHOULD KNOW
Unica i28 Unica i32
HEIGHT 780 mm 780 mm
WIDTH 400 mm 400 mm
DEPTH 358 mm 358 mm
ABOVE 150 mm
BELOW 150 mm
LEFT SIDE 12 mm
RIGHT
SIDE
12 mm
FRONT 600 mm
This booklet is an integral part of the appliance. It is therefore necessary to ensure that the booklet is handed to the person
responsible for the property in which the appliance is located/installed. A replacement copy can be obtained from the Vokèra
website - www.vokera.co.uk.
At the end of its life, the product should be not be disposed of as solid urban waste, but rather it should be handed over to
a dierentiated waste collection centre
.
2
Fig. 1
HOT WATER TEMPERATURE SELECTOR
Move the selector clockwise to increase the hot water outlet temperature, or counter-clockwise to reduce the temperature
PRESSURE GAUGE
Ensure the system pressure is set correctly (minimum 0.5-bar)
MODE SELECTOR SWITCH/HEATING TEMPERATURE SELECTOR
Mode selector switch:
Hot water only - Select this position if you want the boiler to supply hot
water only (no heating)
Hot water temperature selector: move the selector clockwise to increase
the DHW outlet temperature, or counter-clockwise to reduce the temperature
(range: 37°C-60°C)
The display shows the temperature values.
Boiler at OFF/standby - Select this position when you want the boiler to
be switched o for short periods (days) or if the boiler requires to be reset
The display shows “- -”.
Heating & hot water - Select this position when you want the boiler to re-
spond to a heating and hot water request from the time-clock programmer
Heating temperature selector: move the selector clockwise to increase the
heating outlet temperature, or counter-clockwise to reduce the temperature
(range: 40°C-80°C for standard central heating).
The automatic temperature control function (SARA) is set within the blank
bullet points.
The display shows the temperature values.
Pressure gauge shows the current pressure of your heating system, the
gauge should be set between 1 and 1.5 BAR. When the appliance is oper-
ating the gauge may rise or fall slightly, this is quite normal. The minimum
permissible level for the safe and ecient operation of the appliance is 0.5
BAR. Should the pressure fall below 0.5 BAR, the boiler may lockout.
correct pressure
value
MODE SELECTOR SWITCH
HEATING TEMPERATURE SELECTOR
PRESSURE GAUGE
HOT WATER
TEMPERATURE
SELECTOR
DHW pre-heat function - Turning the domestic hot water temperature
adjustment knob to the symbol activates the pre-heating function. Bring the
domestic hot water temperature adjustment knob back to the required po-
sition. The activation of this function is indicated on display with the P icon
ON. This function keeps the water in the domestic hot water exchanger hot,
to reduce standby times when a request is made. The display shows the
delivery temperature of the heating water or the domestic hot water, accor-
ding to the current request. To deactivate the pre-heat function, rotate the
domestic hot water temperature adjustment knob back to the symbol. Bring
the domestic hot water temperature adjustment knob back to the required
position. This function cannot be activated when the boiler is OFF: function
selector to OFF position.
DISPLAY
LED
3
DIGITAL DISPLAY
Fig. 2
Symbol/Icon Description
Displayed when heating mode is active
Displayed when hot water mode is active
Displayed when frost protection function is ac-
tive
Displayed when hot-water pre-heat function is
enabled. Flashes when functioning
Displayed if an alarm or fault has been detected
Displayed when low system pressure has been
detected
Displayed when an external sensor is connected
to the boiler
Displayed if an ignition fault has been detected
2.1 BEFORE SWITCHING ON
Before switching the appliance on, please familiarise yourself
with:
- how to isolate the appliance from the gas, water, and electricity
supplies;
- how to check and top-up – if necessary – the system water
pressure;
- the time clock or programmer (if tted);
- any external thermostats and their functions;
- the appliance controls.
2.2 APPLIANCE CONTROLS (see g. 1)
The appliance controls are situated on the lower front of the
appliance. The appliance controls include:
- pressure gauge;
- appliance mode selector;
- temperature selectors.
NOTE
The appliance frost protection is active in all the boiler modes.
The temperature selectors can be used to vary the temperature
of the water that circulates around your radiators and the water
that ows from your hot water taps. The temperature range is
adjustable between 40
o
C and 80
o
C for the central heating, and
between 37
o
C and 60
o
C for the hot water.
The display normally shows the current time.
Refer to the main appliance status table for fault indicator and
boiler status.
The integral digital time clock is used to switch the heating on
and o at pre-determined intervals.
2.3 LIGHTING THE BOILER
Ensure the gas and electrical supply to the boiler are
turned on.
Turn the mode selector switch to the ON position. When there
is a request for heating or hot water via the time clock or pro-
grammer, the boiler will begin an ignition sequence. When the
appliance reaches the CH set temperature, the burner will go
o for a minimum period of approximately 3 minutes.
When the programmer/time clock or external thermostats
heating request has been satised, the appliance will switch
o automatically.
2.4 ADJUSTING THE HEATING TEMPERATURE
Rotate the temperature selector – clockwise to increase, counter-
clockwise to decrease – to the desired temperature setting. The
temperature can be set from a minimum of 40°C to a maximum
of 80°C (if standard CH mode is selected).
2.5 ADJUSTING THE HOT WATER TEMPERA-
TURE
Rotate the temperature selector – clockwise to increase,
counter-clockwise to decrease – to the desired temperature
setting. The temperature can be set from a minimum of 37°C
to a maximum of 60°C. If the temperature at the outlet is still
not suciently hot enough, it may be necessary to reduce the
ow of water at the hot water outlet (tap).
NOTE
If the appliance fails to ignite during the ignition sequence, it
will enter a lockout condition. Should this occur, please allow
a period of at least two minutes before re-setting the appliance.
2.6 EXPLANATION OF FEATURES
Although the Vokèra Unica has been designed for simplicity
of use, it utilises the latest in boiler technology, enabling a host
of functions to be carried out simultaneously.
2.7 AUTOMATIC TEMPERATURE CONTROL
The automatic temperature control function (SARA), permits
the boiler (when the heating temperature selector is set within
the blank bullet points to automatically adjust (raise) the heating.
The activation and the disable of the function is visualized on
the display if the heating temperature is selected between 55°
-65°C.
2. GETTING STARTED
4
4.1 WHAT IF I SUSPECT A GAS LEAK
If you suspect a gas leak, turn o the gas supply at the gas
meter and contact your installer or local gas supplier. If you
require further advice please contact your nearest Vokèra oce.
4.2 WHAT IF I HAVE FREQUENTLY TO TOP-UP
THE SYSTEM
If the system regularly requires topping-up, it may be indicative
of a leak. Please contact your installer and ask him to inspect
the system.
4.3 WHAT IF THE APPLIANCE IS DUE ITS AN-
NUAL SERVICE
Advice for tenants only
Your landlord should arrange for servicing.
FAULT CODES
4. WHAT IF...
Advice for homeowners
Please contact Vokèra Customer Service (0844 3910999 (UK)
or 056 7755057 (ROI) if you would prefer a Vokèra service
engineer or agent to service your appliance. Alternatively your
local GAS SAFE registered engineer may be able to service
the appliance for you.
4.4 - WHAT IF I NEED TO CALL AN ENGINEER
If you think your boiler may have developed a fault, please contact
your installer or Vokèra Customer Services (0844 3910999 (UK)
or 056 7755057 (ROI) have all your details to hand including
full address and postcode, relevant contact numbers, and your
completed appliance log book.
ALARM CODE CAUSE ACTION
_St AUTOSTOP Call Landlord
_CL CALL FOR SERVICE Call Landlord
A01
Ignition failure
Reset; ensure gas supply is turned on,
if problem persists, call engineer.
A02
Limit thermostat fault
Reset; ensure sucient water pressure,
if problem persists, call engineer
A03
Fan tacho signal fault - air pressure switch Reset; if problem persists, call engineer
A04
Insucient system water pressure
Reset; ensure sucient water pressure,
if problem persists, call engineer
A06
DHW thermistor fault Reset; if problem persists, call engineer
A07
Primary (ow) thermistor fault Reset; if problem persists, call engineer
A08
Primary (Return) thermistor fault - low temperature system ther-
mostat fault
Reset; if problem persists, call engineer
A09
Flue thermistor over temperature or ue thermistor counter fault Reset; if problem persists, call engineer
A11
False ame Temporary
P
Preheating function active None
P blinking
Preheating function running None
3.1 HOW TO TOP-UP THE SYSTEM PRESSURE
(g. 1-2)
The system pressure must be checked periodically to ensure the
correct operation of the boiler. The needle on the gauge should
be reading between 1 and 1.5 BAR when the boiler is in an o
position and has cooled to room temperature. If the pressure
requires ‘topping-up’ use the following instructions as a guide.
- Locate the lling valve connections (usually beneath the
boiler, see g. 3).
- Attach the lling loop to both connections.
- Open the lling valve slowly until you hear water entering the
system.
- Close the lling valve when the pressure gauge (on the boiler)
reads between 1 and 1.5 BAR (see g. 1).
- Remove the lling loop from the connections.
3.2 HOW TO RESET THE APPLIANCE
When the fault code is displayed, the appliance will require
to be reset manually. Before resetting the boiler, check what
action is required to be taken, using the information on the
fault code table on next page. Allow a period of two minutes to
elapse before rotating the mode selector knob across the
position (see g. 1).
IMPORTANT
If the appliance requires to be reset frequently, it may be indica-
tive of a fault, please contact your installer or Vokèra Customer
Services for further advice.
3. HOW TO...
Fig. 3
control
valve
temporary
connection
control
valve
supply pipe
double
check valve
ow/return
pipe
3.3 HOW TO SHUT DOWN THE SYSTEM FOR
SHORT PERIODS
The system and boiler can be shut down for short periods by
simply turning the time clock to the o position. It is also advis-
able to turn o the main water supply to the house.
3.4 HOW TO SHUT DOWN THE SYSTEM FOR
LONG PERIODS
If the house is to be left unoccupied for any length of time –
especially during the winter – the system should be thoroughly
drained of all water. The gas, water, and electricity supply to
the house should also be turned o. For more detailed advice
contact your installer.
3.5 HOW TO CARE FOR THE APPLIANCE
To clean the outer casing use only a clean damp cloth. Do not
use any scour-
ers or abrasive
cleaners.
5
INTRODUCTION
All installers are asked to follow the Benchmark Scheme by
adhering to the Code of Practise, which can be obtained from
www.centralheating.co.uk.
The Unica comprises a range of high-eciency combination
boilers with outputs to DHW of 28kW and 32kW respectively.
These appliances – by design – incorporate electronic ignition,
circulating pump, expansion vessel, safety valve, pressure
gauge and automatic by-pass.
The Unica range is produced as room sealed, category II2H3P
appliances, suitable for internal wall mounting applications only.
Each appliance is provided with a fan powered ue outlet with
an annular co-axial combustion air intake that can be rotated
– horizontally – through 360 degrees for various horizontal or
vertical applications. The Unica can also be used with the
Vokèra twin ue system.
The Unica is approved for use with C13 & C33 type ue
applications. These appliances are designed for use with a
sealed system only; consequently they are not intended for
use on open vented systems. This booklet is an integral part
of the appliance. It is therefore necessary to ensure that the
booklet is handed to the person responsible for the property in
which the appliance is located/installed. A replacement copy
can be obtained from the Vokèra website - www.vokera.co.uk.
INSTALLATION AND SERVICING INSTRUCTIONS
Fig. 4
R F G O I
General layout
1 Three porte valve actuator
2 Drain valve
3 Pressure switch
4 Safety valve
5 Pump
6 Bottom auto air vent (AAV)
7 Condense trap
8 Return thermistor (NTC)
9 Air pressure switch
10 Vacuum detection pipe
11 Degassing hose
12 Sensing Electrode
13 High limit thermostat
14 Flow thermistor (NTC)
15 Top AAV+De-aerator
16 Flue gas analysis test point
17 Flue outlet & air intake
18 Ignition transformer
19 Flues thermistor (NTC)
20 Spark Electrode
21 Burner
22 Main heat exchanger
23 Conveyor
24 Fan assembly
25 Mixer
26 Air intake pipe
27 Expansion vessel
28 Atmospheric connection tube
29 Domestic hot water sensor
30 Domestic hot water heat exchanger
31 Condense trap
32 Gas valve
33 DHW ow meter
R Heating return connection
F Heating ow connection
G Gas connection
O Hot water outlet
I Cold water inlet
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
27
8
1
2
3
4
5
6
7
26
28
29
30
31
32
33
Unica
boiler complies with basic requirements of the following
Directives:
- Regulation (EU) 2016/426;
- Yield directive: Article 7(2) and Annex III of directive 92/42/
EEC;
- Electromagnetic compatibility directive 2014/30/EU;
- Low-voltage directive 2014/35/EU;
- Directive 2009/125/EC Ecodesign for energy-using appli-
ances;
- Regulation (EU) 2017/1369 Energy labeling;
- Delegated Regulation (EU) No. 811/2013;
- Delegated Regulation (EU) No. 813/2013;
- Delegated Regulation (EU) No. 814/2013.
At the end of its life, the product should be not be disposed
of as solid urban waste, but rather it should be handed over
to a dierentiated waste collection centre.
6
1.1 PRINCIPLE COMPONENTS
• A fully integrated electronic control board featuring electronic
temperature control, anti-cycle control, pump over-run, self-
diagnostic fault indicator, full air/gas modulation
• Aluminium heat exchanger
• Electronic ignition with ame supervision
• Integral high-head pump
• Fan
• Expansion vessel
• Water pressure switch
• Flue sensor
• Pressure gauge
• Safety valve
1.2 MODE OF OPERATION (at rest)
When the appliance is at rest and there are no requests for
heating or hot water, the following functions are active:
• frost-protection system – the frost-protection system protects
the appliance against the risk of frost damage both for CH
and DHW. For CH line, if the main temperature falls to 5°C,
the appliance will function on minimum power until the tem-
perature on main reaches 35°C.
Moreover if the DHW temperature falls to 5°C, the appliance
will function on minimum power until the temperature on main
reaches 55°C.
• anti-block function – the anti-block function enables the pump
and divertor valve actuator to be energised for short periods,
when the appliance has been inactive for more than 24-hours.
1.3 MODE OF OPERATION (Heating)
When there is a request for heat via the time clock and/or any
external control, the pump and fan are started, the fan speed
will modulate until the correct signal voltage is received at the
control PCB. At this point an ignition sequence is enabled.
Ignition is sensed by the electronic circuit to ensure ame stability
at the burner. Once successful ignition has been achieved, the
electronic circuitry increases the gas rate to 75% for a period of
15 minutes. Thereafter, the boiler’s output will either be increase
to maximum or modulate to suit the set requirement. When
the appliance reaches the desired temperature the burner will
shut down and the boiler will perform a three-minute anti-cycle
(timer delay).
When the request for heat has been satised the appliance
pump and fan may continue to operate to dissipate any residual
heat within the appliance.
1.4 MODE OF OPERATION (Hot water)
When there is a request for DHW via a hot water outlet or tap,
the pump and fan are started, the fan speed will modulate until
the correct signal voltage is received at the control PCB. At this
point an ignition sequence is enabled.
Ignition is sensed by the electronic circuit to ensure ame stabil-
ity at the burner. Once successful ignition has been achieved,
the electronic circuitry increases the gas rate to maximum or
will modulate output to stabilise the temperature.
In the event of the appliance exceeding the desired temperature
(set point) the burner will shut down until the temperature drops.
When the request for DHW has been satised the appliance
pump and fan may continue to operate to dissipate any residual
heat within the appliance.
Fig. 5
SECTION 1 - DESIGN PRINCIPLES AND OPERATING SEQUENCE
1.5 SAFETY DEVICES
When the appliance is in use, safe operation is ensured by:
• a water pressure switch that monitors system water pressure
and will de-activate the pump, fan, and burner should the
system water pressure drop below the rated tolerance;
• fan speed sensor to ensure safe operation of the burner;
• a high limit thermostat that over-rides the temperature control
circuit to prevent or interrupt the operation of the burner;
• ame sensor that will shut down the burner when no ame
signal is detected;
• ue sensor;
• a safety valve which releases excess pressure from the
primary circuit.
Expansion
vessel
Safety
valve
Pump
Return
temperature
sensor
Main heat
exchanger
Bottom
AAV
Pressure
switch
DHW heat
exchanger
Diverter
valve
Drain
valve
DHW tem-
perature
sensor
Flow temperature
sensor
Top AAV
Automatic
by-pass
DHW
non return
valve
Flow
regulator
CH
return
CH
ow
DHW ow
switch
DHW
inlet
DHW
outlet
7
SECTION 2 - TECHNICAL DATA
2.1 Central Heating Unica i28 Unica i32
Heat input (kW) 20.00 25.00
Maximum heat output (kW) 60/80°C 19.62 24.58
G20 G31 G20 G31
Minimum heat output (kW) 60/80°C 2.76 3.95 3.16 4.45
Maximum heat output (kW) 30/50°C 21.44 26.70
Minimum heat output (kW) 30/50°C 3.00 4.20 3,44 4,74
Minimum working pressure 0.25-0.45 bar
Maximum working pressure 2.5 bar
Minimum ow rate 300 l/h
2.2 Domestic Hot Water Unica i28 Unica i32
Heat input (kW) 28.00 32.00
Flow Rate: ΔT35°C 11.5 13.1
Maximum inlet pressure 6 bar
Minimum inlet pressure 0,2 bar
Minimum ow rate 2 l/min
2.3 Gas Pressures Unica i28 Unica i32
Inlet pressure (G20) 20.0 mbar
Heating maximum gas rate (m
3
/hr) 2.12 2.64
DHW maximum gas rate (m
3
/hr) 2.96 3.38
Minimum gas rate (m
3
/hr) 0.30 0.34
Injector size (mm) 4.70 ap side - 4.20 free side 4.30 ap side - 4.20 free side
2.4 Expansion Vessel Unica i28 Unica i32
Capacity 8 litres
Maximum system volume 76 litres
Pre-charge pressure 1 bar
2.5 Dimensions Unica i28 Unica i32
Height (mm) 780
Width (mm) 400
Depth (mm) 358
Dry weight (kg) 39 42
2.6 Clearances Unica i28 Unica i32
Sides 12mm
Top 150mm from casing or 25mm above ue elbow (whichever is applicable)
Bottom 150mm
Front 600mm
2.7 Connections Unica i28 Unica i32
Flow & return 22mm
Gas 15mm
DHW hot & cold 15mm
Safety valve 15mm
Condense
21mm
2.8 Electrical Unica i28 Unica i32
Power consumption - maximum heating power
(Watts) 68 82
Power consumption maximum dhw power (Watts)
86 103
Pump power comsuption (1.000 l/h) (Watts) 39
Voltage (V/Hz) 230/50
Internal fuse 3.15A T (for PCB) - 3.15A F (for connections block)
External fuse 3A
2.9 Flue Details (concentric 60-100) Unica i28 Unica i32
Maximum horizontal ue length (60/100mm) 7.80m 7.80m
Maximum vertical ue length (60/100mm) 8.80m 8.80m
2.9A Flue Details (concentric 80-125) Unica i28 Unica i32
Maximum horizontal ue length (80/125mm) 20m 20m
Maximum vertical ue length (80/125mm) 25m 25m
2.9B Flue Details (twin pipes) Unica i28 Unica i32
Maximum horizontal ue length (80mm/80mm) 50m/50m 50m/50m
Maximum vertical ue length (80mm/80mm) 50m/50m 50m/50m
2.10 Eciency Unica i28 Unica i32
SEDBUK (%) 2005 90.30 90.39
2.11 Emissions Unica i28 Unica i32
CO2 @ maximum output (%) 9.0 9.0
CO2 @ minimum output (%) 9.0 9.0
CO @ maximum output (ppm) 150 150
CO @ minimum output (ppm) 10 5
Nox rating class 6 class 6
8
Unica i28
Unica i 32
Seasonal space heating energy efficiency
class
A
Water heating energy efficiency
class
A
Parameter Symbol Value Unit Parameter Symbol Value Unit
Rated heat output Prated 20 kW
Seasonal space heating energy
efficiency
ηs 93 %
For boiler space heaters and boiler combination
heaters: useful heat output
For boiler space heaters and boiler combination heaters:
useful efficiency
At rated heat output and high-
temperature regime (*)
P4 19.6 kW
At rated heat output and high-
temperature regime (*)
η4 88.6 %
At 30% of rated heat output and
low-temperature regime (**)
P1 6.6 kW
At 30% of rated heat output and
low-temperature regime (**)
η1 98.7 %
Auxiliary electricity consumption Other parameters
At full load elmax 29.0 W Stand-by heat loss Pstby 26.0 W
At part load elmin 12.6 W Pilot flame energy consumption Pign - W
In Stand-by mode PSB 5.6 W Annual energy consumption QHE 40 GJ
Sound power level, indoors LWA 51 dB
Emissions of nitrogen oxides NOx 29 mg/kWh
For combination heaters:
Declared load profile XL Water heating energy efficiency ηwh 85 %
Daily electricity consumption Qelec 0.149 kWh Daily fuel consumption Qfuel 22.827 kWh
Annual electricity consumption AEC 33 kWh Annual fuel consumption AFC 17 GJ
(*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
(**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C
return temperature (at heater inlet).
Seasonal space heating energy efficiency
class
A
Water heating energy efficiency
class
A
Parameter Symbol Value Unit Parameter Symbol Value Unit
Rated heat output Prated 25 kW
Seasonal space heating energy
efficiency
ηs 94 %
For boiler space heaters and boiler combination
heaters: useful heat output
For boiler space heaters and boiler combination heaters:
useful efficiency
At rated heat output and high-
temperature regime (*)
P4 24.6 kW
At rated heat output and high-
temperature regime (*)
η4 88.5 %
At 30% of rated heat output and
low-temperature regime (**)
P1 8.2 kW
At 30% of rated heat output and
low-temperature regime (**)
η1 99.0 %
Auxiliary electricity consumption Other parameters
At full load elmax 43.0 W Stand-by heat loss Pstby 29.0 W
At part load elmin 16.8 W Pilot flame energy consumption Pign - W
In Stand-by mode PSB 5.6 W Annual energy consumption QHE 47 GJ
Sound power level, indoors LWA 53 dB
Emissions of nitrogen oxides NOx 35 mg/kWh
For combination heaters:
Declared load profile XL Water heating energy efficiency ηwh 84 %
Daily electricity consumption Qelec 0.176 kWh Daily fuel consumption Qfuel 23.137 kWh
Annual electricity consumption AEC 39 kWh Annual fuel consumption AFC 18 GJ
(*) High-temperature regime means 60 °C return temperature at heater inlet and 80 °C feed temperature at heater outlet.
(**) Low temperature means for condensing boilers 30 °C, for low-temperature boilers 37 °C and for other heaters 50 °C
return temperature (at heater inlet).
9
Key Location Minimum distance
A Below an opening (window, air-brick, etc.) 300 mm
B Above an opening (window, air-brick, etc.) 300 mm
C To the side of an opening (window, air-brick, etc.) 300 mm
D Below gutter, drain-pipe, etc. 25 mm
E Below eaves 25 mm
F Below balcony, car-port roof, etc. 25 mm
G To the side of a soil/drain-pipe, etc. 25 mm (60mm for 80/125 - 5” ue)
H From internal/external corner 25 mm (60mm for 80/125 - 5” ue)
I Above ground, roof, or balcony level 300 mm
J From a surface or boundary facing the terminal 600 mm
K From a terminal facing a terminal 1200 mm
L From an opening in the car-port into the building 1200 mm
M Vertically from a terminal on the same wall 1500 mm
N Horizontally from a terminal on the same wall 300 mm
P From a structure to the side of the vertical terminal 300 mm
Q From the top of the vertical terminal to the roof ashing As determined by the xed collar
of the vertical terminal
R To the side of a boundary 300 mm
S To the side of an opening or window on a pitched roof 600 mm
T Below an opening or window on a pitched roof 2000 mm
V From a vertical terminal to an adjacent opening (window, air-brick, etc.) (call Vokera technical for advice)
W From a vertical terminal to an adjacent vertical terminal 300 mm (only if both terminals are the same height)
Fig. 6
2.12 PUMP DUTY
Fig. 6 shows the ow-rate available – after allowing for pressure loss through the appliance – for system requirements. When
using this graph, apply only the pressure loss of the system.
Fig. 7
Flow rate (l/h)
Residual head (x 100 mbar)
0 100 200
0
50
100
150
200
250
300
350
400
450
500
550
600
300 400 500 600 700 800 900 1000 1100 1200
PWM area
10
SECTION 3 - GENERAL REQUIREMENTS (UK)
This appliance must be installed by a competent person in ac-
cordance with the Gas Safety (Installation & Use) Regulations.
3.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the
relevant requirements of the Gas Safety (Installation & Use)
Regulations, the local building regulations, the current I.E.E.
wiring regulations, the bylaws of the local water authority, the
Building Standards (Scotland) Regulation and Building Stand-
ards (Northern Ireland) Regulations.
It should be in accordance also with any relevant requirements
of the local authority and the relevant recommendations of the
following British Standard Codes of Practice.
ATTENTION
The use of PPE (Personal Protective Equipment) such as but
not limited to gloves, mask, safety glasses, etc. is strongly
recommended whenever carrying out the installation, repair,
or maintenance of this appliance – please pay particular at-
tention to:
• Sharp edges that may be encountered when:- handling or
lifting the appliance, removing parts, etc. during installation
and maintenance
•
Airborne particles that may be released and/or disturbed when
cleaning or removing components during maintenance
• Water treatment chemicals that could have been added to
the system water may spill from the appliance and or com-
ponents during maintenance
Please refer to an appropriate Health and Safety document
such as HSE L23 (UK) or S.I. 299 (Ireland), for more detailed
advice on safe working practices and procedures.
3.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements of the
current I.E.E. wiring regulations, and in Scotland, the electrical
provisions of the Building Regulations, with respect to the instal-
lation of the appliance in a room or internal space containing
a bath or shower. When an appliance is installed in a room or
internal space containing a bath or shower, the appliance or
any control pertaining to it must not be within reach of a person
using the bath or shower.
BS 5440 PART 1 FLUES
BS 5440 PART 2 FLUES & VENTILATION
BS 5449 PART 1 FORCED CIRCULATION HOT WATER SYSTEMS
BS 5546 INSTALLATION OF GAS HOT WATER SUPPLIES FOR DOMESTIC PURPOSES
BS 6798 INSTALLATION OF BOILERS OF RATED INPUT NOT EXCEEDING 60kW
BS 6891 LOW PRESSURE INSTALLATION PIPES
BS 7074 PART 1 APPLICATION, SELECTION AND INSTALLATION OF EXPANSION VESSELS AND ANCILLARY
EQUIPMENT FOR SEALED WATER SYSTEMS
The location chosen for the appliance must permit the provision
of a safe and satisfactory ue and termination. The location must
also permit an adequate air supply for combustion purposes
and an adequate space for servicing and air circulation around
the appliance. Where the installation of the appliance will be in
an unusual location special procedures may be necessary, BS
6798 gives detailed guidance on this aspect. A compartment
used to enclose the appliance must be designed and constructed
specically for this purpose. An existing compartment/cupboard
may be utilised provided that it is modied to suit. Details of
essential features of compartment/cupboard design including
airing cupboard installations are given in BS 6798. This appli-
ance is not suitable for external installation.
3.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be
checked to ensure that it is of adequate size to deal with the
maximum rated input of all the appliances that it serves. Instal-
lation pipes must be tted in accordance with BS 6891.
Pipe work from the meter to the appliance must be of adequate
size. Pipes of a smaller size than the appliance gas inlet con-
nection must not be used. The installation must be tested for
tightness in accordance with BS6891.
If the gas supply serves more than one appliance, it must be
ensured that an adequate supply is maintained to each appli-
ance when they are in use at the same time.
3.4 FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage
and discoloration that may occur to building products located
nearby. The terminal must not be located in a place where it
is likely to cause a nuisance (see g. 7). In cold and/or humid
weather, water vapour will condense on leaving the terminal;
the eect of such pluming must be considered. If installed less
than 2m above a pavement or platform to which people have
access (including balconies or at roofs) the terminal must be
protected by a guard of durable material. The guard must be
tted centrally over the terminal. Refer to BS 5440 Part 1, when
the terminal is 0.5 metres (or less) below plastic guttering or 1
metre (or less) below painted eaves.
3.5 AIR SUPPLY
The following notes are intended for general guidance only.
This appliance is a room-sealed, fan-ued boiler, consequently
it does not require a permanent air vent for combustion air sup-
ply. When installed in a cupboard or compartment, ventilation
for cooling purposes is also not required.
3.6 WATER CIRCULATION
Detailed recommendations are given in BS 5449 Part 1 and
BS 6798. The following notes are for general guidance only.
3.6.1 PIPEWORK
It is recommended that copper tubing to BS 2871 Part 1 is used
in conjunction with soldered capillary joints. Where possible
pipes should have a gradient to ensure air is carried naturally to
air release points and that water ows naturally to drain cocks.
Except where providing useful heat, pipes should be insulated
to avoid heat loss and in particular to avoid the possibility of
freezing. Particular attention should be paid to pipes passing
through ventilated areas such as under oors, loft space and
void areas.
3.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, consequently
there is no requirement for an external by-pass, however the
design of the system should be such that it prevents boiler
‘cycling’.
3.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate
draining of the appliance and all water pipes connected to the
appliance. The drain cocks must be manufactured in accord-
ance with BS 2879.
3.6.4 AIR RELEASE POINTS
These must be positioned at the highest points in the system
where air is likely to be trapped. They should be used to expel
trapped air and allow complete lling of the system.
3.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accom-
modate the increased volume of water when the system is
heated. It can accept up to 8 litres of expansion from within
the system, generally this is sucient, however if the system
has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).
11
This appliance must be installed by a competent person in
accordance with and dened by, the Standard Specication
(Domestic Gas Installations) Declaration (I.S. 813).
ATTENTION
The use of PPE (Personal Protective Equipment) such as but
not limited to gloves, mask, safety glasses, etc. is strongly
recommended whenever carrying out the installation, repair,
or maintenance of this appliance – please pay particular at-
tention to:
• Sharp edges that may be encountered when:- handling or
lifting the appliance, removing parts, etc. during installation
and maintenance
•
Airborne particles that may be released and/or disturbed when
cleaning or removing components during maintenance
• Water treatment chemicals that could have been added to
the system water may spill from the appliance and or com-
ponents during maintenance
Please refer to an appropriate Health and Safety document
such as HSE L23 (UK) or S.I. 299 (Ireland), for more detailed
advice on safe working practices and procedures.
SECTION 3A - GENERAL REQUIREMENTS (EIRE)
3A.1 RELATED DOCUMENTS
The installation of this boiler must be in accordance with the
relevant requirements of the local building regulations, the
current ETCI National Rules for Electrical Installations and the
bylaws of the local water undertaking.
It should be in accordance also with any relevant requirements
of the local and/or district authority.
3A.2 LOCATION OF APPLIANCE
The appliance may be installed in any room or internal space,
although particular attention is drawn to the requirements of
the current ETCI National Rules for Electrical Installations, and
I.S. 813, Annex K.
When an appliance is installed in a room or internal space
containing a bath or shower, the appliance or any control
pertaining to it must not be within reach of a person using the
bath or shower.
The location chosen for the appliance must permit the provision
of a safe and satisfactory ue and termination. The location must
also permit an adequate air supply for combustion purposes
and an adequate space for servicing and air circulation around
the appliance.
3.6.6 FILLING POINT
A method for initial lling of the system and replacing water lost
during servicing etc. directly from the mains supply, should be
provided (see g. 8). This method of lling complies with the
current Water Supply (Water Fittings) Regulations 1999 and
Water Bylaws 2000 (Scotland). If an alternative location is
preferred, it should be connected as detailed in g. 8.
3.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of lling the system would be from an
independent make-up vessel or tank mounted in a position at
least 1 metre above the highest point in the system and at least
5 metres above the boiler (see g. 9).
The cold feed from the make-up vessel or tank must be tted
with an approved non-return valve and stopcock for isolation
purposes. The feed pipe should be connected to the return pipe
as close to the boiler as possible.
3.6.8 FREQUENT FILLING
Frequent lling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable of
withstanding pressures up to at least 3 bar.
3.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electri-
cal supply; it must be protected with a 3-amp fuse. The method
of connection to the mains electricity supply must allow for
complete isolation from the supply. The preferred method is by
using a double-pole switch fused spur with a contact separation
of at least 3,5mm (3° high-voltage category). The switch must
only supply the appliance and its corresponding controls, i.e.
time clock, room thermostat, etc. Alternatively an un-switched
shuttered socket with a fused 3-pin plug both complying with
BS 1363 is acceptable.
3.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be tted on a wall of combustible mate-
rial, there is no requirement for a sheet of reproof material to
protect the wall.
3.9 TIMBER FRAMED BUILDINGS
If the appliance is to be tted in a timber framed building, it
should be tted in accordance with the Institute of Gas Engineers
publication (IGE/UP/7) ‘Guide for Gas Installations in Timber
Frame Buildings’.
3.10 INHIBITORS
Vokèra recommend that an inhibitor - suitable for use with
aluminium heat exchangers - is used to protect the boiler and
system from the eects of corrosion and/or electrolytic action.
The inhibitor must be administered in strict accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with BS 7593
and the Domestic Water Treatment Association’s (DWTA) code
of practice.
3.11 SHOWERS
If the appliance is intended for use with a shower, the shower
must be thermostatically controlled and be suitable for use with
a combination boiler.
ow/return
pipe
control
valve
temporary
connection
control
valve
supply
pipe
double
check valve
Fig. 8
Fig. 9
Make-up vessel
or tank
Automatic
air-vent
Non-return
valve
Stopcock
5.0 metres minimum
Heating
return
12
Where the installation of the appliance will be in an unusual
location special procedures may be necessary, refer to I.S. 813
for detailed guidance on this aspect.
A compartment used to enclose the appliance must be de-
signed and constructed specically for this purpose. An exist-
ing compartment/cupboard may be utilised provided that it is
modied to suit.
This appliance is not suitable for external installation.
3A.3 GAS SUPPLY
The gas meter – as supplied by the gas supplier – must be
checked to ensure that it is of adequate size to deal with the
maximum rated input of all the appliances that it serves. Instal-
lation pipes must be tted in accordance with I.S. 813.
Pipe work from the meter to the appliance must be of adequate
size. Pipes of a smaller size than the appliance gas inlet con-
nection must not be used. The installation must be tested for
tightness in accordance with I.S. 813.
If the gas supply serves more than one appliance, it must be
ensured that an adequate supply is maintained to each appli-
ance when they are in use at the same time.
3A.4 FLUE SYSTEM
The terminal should be located where the dispersal of combustion
products is not impeded and with due regard for the damage
and discoloration that may occur to building products located
nearby. The terminal must not be located in a place where it
is likely to cause a nuisance (see I.S. 813).
In cold and/or humid weather, water vapour will condense
on leaving the terminal; the eect of such pluming must be
considered.
If installed less than 2m above a pavement or platform to
which people have access (including balconies or at roofs)
the terminal must be protected by a guard of durable material.
The guard must be tted centrally over the terminal. Refer to
I.S. 813, when the terminal is 0.5 metres (or less) below plastic
guttering or 1 metre (or less) below painted eaves.
3A.5 AIR SUPPLY
The following notes are intended for general guidance only.
This appliance is a room-sealed, fan-ued boiler, consequently it
does not require a permanent air vent for combustion air supply.
When installed in a cupboard or compartment, ventilation for
cooling purposes is also not required.
3A.6 WATER CIRCULATION
Specic recommendations are given in I.S. 813. The following
notes are for general guidance only.
3A.6.1 PIPEWORK
It is recommended that copper tubing be used in conjunction
with soldered capillary joints.
Where possible pipes should have a gradient to ensure air
is carried naturally to air release points and that water ows
naturally to drain cocks.
Except where providing useful heat, pipes should be insulated
to avoid heat loss and in particular to avoid the possibility of
freezing. Particular attention should be paid to pipes passing
through ventilated areas such as under oors, loft space and
void areas.
3A.6.2 AUTOMATIC BY-PASS
The appliance has a built-in automatic by-pass, consequently
there is no requirement for an external by-pass, however the
design of the system should be such that it prevents boiler
‘cycling’.
3A.6.3 DRAIN COCKS
These must be located in accessible positions to facilitate
draining of the appliance and all water pipes connected to the
appliance.
3A.6.4 AIR RELEASE POINTS
These must be positioned at the highest points in the system
where air is likely to be trapped. They should be used to expel
trapped air and allow complete lling of the system.
3A.6.5 EXPANSION VESSEL
The appliance has an integral expansion vessel to accom-
modate the increased volume of water when the system is
heated. It can accept up to 8 litres of expansion from within
the system, generally this is sucient, however if the system
has an unusually high water content, it may be necessary to
provide additional expansion capacity (see 6.18).
3A.6.6 FILLING POINT
A method for initial lling of the system and replacing water
lost during servicing etc. should be provided (see g. 8). You
should ensure this method of lling complies with the local water
authority regulations.
3A.6.7 LOW PRESSURE SEALED SYSTEM
An alternative method of lling the system would be from an
independent make-up vessel or tank mounted in a position
at least 1 metre above the highest point in the system and at
least 5 metres above the boiler (see g. 9). The cold feed from
the make-up vessel or tank must be tted with an approved
non-return valve and stopcock for isolation purposes. The feed
pipe should be connected to the return pipe as close to the
boiler as possible.
3A.6.8 FREQUENT FILLING
Frequent lling or venting of the system may be indicative
of a leak. Care should be taken during the installation of the
appliance to ensure all aspects of the system are capable of
withstanding pressures up to at least 3 bar.
3A.7 ELECTRICAL SUPPLY
The appliance is supplied for operation on 230V @ 50Hz electri-
cal supply; it must be protected with a 3-amp fuse. The method
of connection to the mains electricity supply must allow for
complete isolation from the supply. The preferred method is by
using a double-pole switch fuse spur with a contact separation
of at least 3,5 mm (3° high-voltage category). The switch must
only supply the appliance and its corresponding controls, i.e.
time clock, room thermostat, etc.
3A.8 MOUNTING ON A COMBUSTIBLE SURFACE
If the appliance is to be tted on a wall of combustible mate-
rial, there is no requirement for a sheet of reproof material to
protect the wall.
3A.9 TIMBER FRAMED BUILDINGS
If the appliance is to be tted in a timber framed building, it
should be tted in accordance with I.S. 813 and local Building
Regulations.
The Institute of Gas Engineers publication (IGE/UP/7) ‘Guide
for Gas Installations in Timber Frame Buildings’ gives specic
advice on this type of installation.
3A.10 INHIBITORS
Vokèra recommend that an inhibitor - suitable for use with
aluminium heat exchangers - is used to protect the boiler and
system from the eects of corrosion and/or electrolytic action.
The inhibitor must be administered in strict accordance with
the manufacturers instructions*.
*Water treatment of the complete heating system - including
the boiler - should be carried out in accordance with I.S. 813
and the Domestic Water Treatment Association’s (DWTA) code
of practice.
3A.11 SHOWERS
If the appliance is intended for use with a shower, the shower
must be thermostatically controlled and be suitable for use with
a combination boiler.
3A.12 DECLARATION OF CONFORMITY
A Declaration of Conformity (as dened in I.S. 813) must be
provided on completion of the installation.
A copy of the declaration must be given to the responsible
person and also to the gas supplier if required.
13
NOTE
Please refer to Section 3, Para 3.1 and use the appropriate PPE
when carrying out any of the actions or procedures contained
within this section.
4.1 DELIVERY
Due to the weight of the appliance it may be necessary for
two people to lift and attach the appliance to its mounting. The
appliance is contained within a heavy-duty cardboard carton.
Lay the carton on the oor with the writing the correct way up.
4.2 CONTENTS
Contained within the carton is:
• the boiler
• the wall bracket
• carton template
• an accessories pack containing appliance service connections
and washers
• the instruction pack containing the installation, servicing & user
instructions, guarantee registration card and a 3-amp fuse.
4.3 UNPACKING
At the top of the carton pull both sides open – do not use a
knife – unfold the rest of the carton from around the appliance,
carefully remove all protective packaging from the appliance and
lay the accessories etc. to one side. Protective gloves should
be used to lift the appliance, the appliance back-frame should
be used for lifting points.
4.4 PREPARATION FOR MOUNTING THE AP-
PLIANCE
The appliance should be mounted on a smooth, vertical, non-
combustible surface, which must be capable of supporting the
full weight of the appliance. Care should be exercised when
determining the position of the appliance with respect to hidden
obstructions such as pipes, cables, etc.
When the position of the appliance has been decided – using
the template supplied – carefully mark the position of the wall-
mounting bracket (see g. 10) and ue-hole (if applicable).
4.4.1 FITTING THE PRE-FIXING JIG
When the position of the appliance has been decided – using
the template supplied – carefully mark the position of the wall
mounting bracket/pre-xing jig (see g. 10) and ue-hole (if
applicable). Once the pre-xing jig is in place, the pipework
can now be tted. Fit the pipework to sit within the pre-formed
guides of the xing jig and to the required length for ether a
standard wall or stando bracket (see g 10).
Once the pipes have been tted, the jig can now be removed
(see g 13).
SECTION 4 - INSTALLATION
Fig. 10
Fig. 11
Fig. 12
Fig. 13
Fig. 14
without rear spacer kit use position 2
with rear spacer kit use position 4
2
2
2
2 2
2
4
4
4
4 4 4
14
4.5 FITTING THE FLUE
The top ue outlet permits both horizontal and vertical ue ap-
plications to be considered, alternatively, the Vokèra twin ue
system can be utilised if longer ue runs are required.
4.5.1 CONCENTRIC HORIZONTAL FLUE
(For concentric vertical ue, see 4.5.2).
(For twin ue applications, see 4.5.3).
The appliance can be used with either the Vokèra condensing
60/100mm concentric ue system or the optional 80/125mm
concentric ue system.
NOTE
These instructions relate only to the Vokèra condensing
60/100mm concentric ue system. For specic details on the
installation of the 80/125mm concentric ue system please refer
to the instructions supplied. The appliance ue outlet elbow can
be rotated through 360º on its vertical axis. In addition the ue
may be extended from the outlet elbow in the horizontal plane
(see 2.9). A reduction must also be made to the maximum length
(see table below) when additional bends are used.
Reduction for additional bends
Bend Reduction in maximum ue length for each bend
45° bend 1.0 metre (60/100) - 1.0 metre (80/125)
90° bend 1.0 metre (60/100) - 1.0 metre (80/125)
Horizontal ue terminals and accessories
Part No. Description Length
29450120 Horizontal ue kit 900 mm
29450121 Telescopic ue kit 455/630 mm
522
Plume management kit 1370 mm
29450123 90-degree bend N/A
29450124 45-degree bends (pair) N/A
29450125 500mm extension 500 mm
29450126 1000mm extension 1000 mm
29450127 2000m extension 2000 mm
29450128 Telescopic extension 372/519 mm
529 Wall bracket pack (5) 208mm
Using the template provided, mark and drill a 125mm hole for
the passage of the ue pipe. The hole should be drilled to ensure
any condense uid that forms, is allowed to drain back to the
appliance (see g. 12-14). The xing holes for the wall-mounting
bracket should now be drilled and plugged, an appropriate type
and quantity of xing should be used to ensure that the bracket
is mounted securely. Once the bracket has been secured to
the wall, mount the appliance onto the bracket.
Fig. 15
FITTING THE HORIZONTAL FLUE KIT
Carefully measure the distance from the centre of the appliance
ue outlet to the edge of the nished outside wall (dimension
X). Add 65mm to dimension X to give you Dimension Y (see
g 16). Measure dimension Y from the terminal end of the con-
centric ue pipe and cut o the excess ensuring any burrs are
removed. Pass the concentric ue pipe through the previously
drilled hole. Fit the ue bend to the boiler ue outlet and insert
the concentric ue pipe into the ue bend ensuring the correct
seal is made. Using the clamp, gasket, and screws supplied,
secure the ue bend to the appliance ue spigot.
NOTE
Fit the internal (white) trim to the ue assembly prior to con-
necting the ue pipe to the bend.
You must ensure that the entire ue system is properly sup-
ported and connected. Seal the ue assembly to the wall using
cement or a suitable alternative that will provide satisfactory
weatherproong. The exterior trim can now be tted.
Terminal or
extension
Outer clamps
15
EXTENDING THE FLUE
Connect the bend – supplied with the terminal kit – to the top
of the boiler using clamp (supplied) see g. 15. The additional
bends & extensions have push-t connections, care should be
taken to ensure that the correct seal is made when assembling
the ue system. Connect the required number of ue exten-
sions or bends (up to the maximum equivalent ue length) to
the ue terminal (see g. 15-17). The ue system should have
a minimum of 1º; maximum of 3º rise from the boiler to outside,
to ensure any condense uid that forms, is allowed to drain
back to the appliance.
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the exten-
sion. Remove any burrs, and check that all seals are located
properly. You must ensure that the entire ue system is properly
supported and connected. Seal the ue assembly to the wall us-
ing cement or a suitable alternative that will provide satisfactory
weatherproong. The interior and exterior trim can now be tted.
Fig. 17
4.5.1.2 FITTING THE REAR FLUE ( g. 18) (rear ue outlet
only)
Using the template provided, mark and drill a 125mm hole
for the passage of the ue pipe, see g 12. The hole should
be drilled LEVEL to ensure any condense uid that forms, is
allowed to drain back to the appliance. The xing holes for
the wall mounting bracket should now be drilled and plugged,
an appropriate type and quantity of xing should be used to
ensure that the bracket is mounted securely. Once the bracket
has been secured to the wall, remove the blanking plate from
the rear of the boiler (Fig.20).
NOTE The inner 60mm pipe of the rear ue terminal must be
cut by 12mm at the point indicated (g.18 pos. A).
Fig.18
Fig.20
Using the screws and washers provided, secure the appliance
onto the wall bracket and tighten with a suitable spanner.
Seal the ue assembly to the wall using cement or a suitable
alternative that will provide satisfactory weatherproong. The
exterior wall trim can now be tted.
Part No. Description Length
29450133 Rear ue terminal 825 mm
Fig.19
Fig. 16
Attach the rear ue terminal to the appliance (using the pre-
viously retained screws) and x the telescopic terminal to the
correct length (wall thickness) ensuring that the terminal will
protrude through the wall by the correct distance. At this point,
lift the appliance and carefully insert the terminal into and
through the wall, ensuring that the holes in the appliance back
frame are aligned with the studs on the wall bracket.
Seal the top ue outlet of the boiler with the blanking plate
provided with the rear ue kit (Fig. 19).
218
16
4.5.2 CONCENTRIC VERTICAL FLUE
The appliance can be used with either the Vokèra condensing
60/100mm concentric ue system or the optional 80/125mm
concentric ue system.
NOTE
These instructions relate only to the Vokèra condensing
60/100mm concentric ue system. For specic details on the
installation of the 80/125mm concentric ue system please refer
to the instructions supplied.
The vertical ue terminal can be connected directly to the ap-
pliance ue outlet. Alternatively, an extension or bend can be
connected to the appliance ue outlet if desired, however if
additional bends are tted, a reduction must be made to the
maximum ue length (see table below).
Bend Reduction in maximum ue length for each bend
45° bend 1.0 metre (60/100) - 1.0 metre (80/125)
90° bend 1.0 metre (60/100) - 1.0 metre (80/125)
Vertical ue terminal and accessories
Part No. Description Length
29450120 Horizontal ue kit 900 mm
29450122 Vertical ue terminal 1000 mm
531 Pitched roof ashing plate N/A
532 Flat roof ashing plate N/A
29450123 90-degree bend N/A
29450124 45-degree bends (pair) N/A
29450125 500mm extension 500 mm
29450126 1000mm extension 1000 mm
29450127 2000m extension 2000 mm
29450128 Telescopic extension 372/519 mm
529 Wall bracket pack (5) 208mm
Using the dimensions given in g. 21 as a reference, mark and
cut a 125mm hole in the ceiling and/or roof.
Fig. 21
“X”
12/15/20HE = 202mm
25/30/35HE = 218mm
130mm
Fit the appropriate ashing plate to the roof and insert the ver-
tical ue terminal through the ashing plate from the outside,
ensuring that the collar on the ue terminal ts over the ashing.
The xing holes for the wall-mounting bracket should now be
drilled and plugged, an ‘appropriate type and quantity of xing
should be used to ensure that the bracket is mounted securely.
Once the bracket has been secured to the wall, mount the ap-
pliance onto the bracket.
IMPORTANT
The vertical ue terminal is 1.0 metre in length and cannot be
cut; therefore it may be necessary to adjust the height of the
appliance to suit or use a suitable extension.
Connect the vertical ue assembly to the boiler ue spigot us-
ing the 100mm clip, gasket & screws (supplied), ensuring the
correct seal is made. The ue support bracket (supplied with
the vertical ue kit) can now be tted.
If the vertical ue requires extension/s or additional bend/s,
connect the required number of ue extensions or bends (up
to the maximum equivalent ue length) between the boiler and
vertical ue assembly (see g. 17).
Ensure that any horizontal sections of the ue system have a
minimum 1º; maximum 3º fall back to the boiler (1º = 17mm
per 1000mm).
NOTE
When cutting an extension to the required length, you must
ensure that the excess is cut from the plain end of the exten-
sion. Remove any burrs, and check that any seals are located
properly.
You must ensure that the entire ue system is properly sup-
ported and connected.
4.5.3 TWIN FLUE SYSTEM
The Vokèra twin ue system enables greater ue distances
to be achieved than that of a concentric ue system. It can be
used for horizontal or vertical applications, however the twin
ue system must be converted to the dedicated concentric
ue kit for termination. It is essential that the installation of the
twin ue system be carried out in strict accordance with these
instructions.
GUIDANCE NOTES ON TWIN FLUE INSTALLATION
• The ue must have a have a minimum 1º; maximum 3º (1º =
17mm per 1000mm) fall back to the appliance to allow any
condensate that may form in the ue system to drain via the
condensate drain. Consideration must also be given to the
fact that there is the possibility of a small amount of conden-
sate dripping from the terminal.
• Ensure that the entire ue system is adequately supported,
use at least one bracket for each extension.
• As the exhaust outlet pipe can reach very high temperatu-
res it must be protected to prevent persons touching the hot
surface.
• The condensate drain pipe must be connected in accordan-
ce with building regulations
Reduction for bends
Bend Reduction in maximum ue length for each bend
45° bend 1.0 metre
90° bend 1.0 metre
Twin ue accessories
Part No. Description Length
0225805 Horizontal ue terminal 1.0 metre
0225810 Vertical ue terminal 1.0 metre
359 Twin adapter kit N/A
531 Pitched roof ashing plate N/A
532 Flat roof ashing plate N/A
0225815 Condensate drain kit N/A
0225820 0.25m extension (pair) 250mm
0225825 0.5m extension (pair) 500 mm
0225830 1.0m extension (pair) 1000 mm
0225835 2.0m extension (pair) 2000 mm
0225840 45º bend (pair) N/A
0225845 90º bend (pair) N/A
0225850 Twin bracket (5) N/A
0225855 Single bracket (5) N/A
MOUNTING THE BOILER
The xing holes for the wall-mounting bracket should now be
drilled and plugged, an appropriate type and quantity of xing
should be used to ensure that the bracket is mounted securely.
Once the bracket has been secured to the wall, mount the ap-
pliance onto the bracket.
17
NOTE
Seal the ue terminal assembly to the wall using cement or a
suitable alternative that will provide satisfactory weatherproof-
ing. The interior and exterior trim can now be tted.
VERTICAL TERMINATION (g. 25)
The twin ue system must be converted to the dedicated con-
centric ue kit for termination.
• The vertical terminal is supplied with a built-in converter box
and cannot be shortened.
• A 130mm hole is required for the passage of the concentric
terminal through the ceiling and/or roof.
Depending on site conditions it may be preferable to install the
terminal assembly prior to tting the twin ue pipes.
Fit the appropriate ashing plate to the roof and insert the ver-
tical ue terminal through the ashing plate from the outside,
ensuring that the collar on the ue terminal ts over the ashing.
Push-t the twin ue pipes onto the concentric to twin converter
ensuring that the exhaust pipe connects to the exhaust con-
nection on the concentric to twin converter.
If necessary cut the plain ends (male) of the twin ue pipes to
allow connection to the concentric to twin converter.
NOTE
• Before cutting twin ue pipes ensure allowances have been
made for connection onto the previous piece and onto the
concentric to twin converter. The last twin ue pipes must
be pushed 50mm onto the male spigots of the concentric to
twin converter.
• You must ensure that the entire ue system is properly sup-
ported and connected.
• Ensure that any horizontal sections of pipe have a fall
of between 1 & 3º towards the appliance (1º =17mm per
1000mm).
Fig. 24
Fig. 25
Fig. 22
HORIZONTAL TERMINATION (g. 24)
The twin ue system must be converted to the dedicated con-
centric ue kit for termination.
• The horizontal terminal is supplied with a built-in converter
box and cannot be shortened.
• A 130mm hole is required for the passage of the concentric
terminal through the wall.
• The air inlet pipe must always be level with or below, that of
the exhaust pipe.
Depending on site conditions it may be preferable to install the
terminal assembly prior to tting the twin ue pipes.
Mark and drill a level 130mm hole for the passage of the horizontal
ue terminal. Insert the terminal assembly into the ue hole.
Push-t the twin ue pipes onto the concentric to twin converter
box ensuring that the exhaust pipe connects to the exhaust
connection on the concentric to twin converter.
If necessary cut the plain ends (male) of the twin ue pipes to
allow connection to the concentric to twin converter.
NOTE
Before cutting twin ue pipes ensure allowances have been
made for connection onto the previous piece and onto the
concentric to twin converter. The last twin ue pipes must be
pushed 50mm onto the male spigots of the concentric to twin
converter.
INSTALLATION OF TWIN ADAPTOR KIT (g. 22 & 23)
• Insert the exhaust connection manifold (A) onto the appliance
ue outlet.
• Remove the blanking plate (located to the left of the appliance
ue outlet) and – using the same screws – install the air inlet
plate (B).
• Using the hole in the exhaust connection manifold as a guide,
drill a 3mm hole in the appliance ue spigot and secure the
exhaust manifold connection to the ue spigot using the screw
provided (C).
• Using the two holes in the air inlet plate as a guide, drill a
3mm hole in each and secure the air inlet pipe/bend using
the screws provided.
The twin ue pipes extensions and accessories can now be
installed by pushing together (the plain end of each extension
or bend should be pushed approximately 50mm into the female
socket of the previous piece).
B
A
C
Fig. 23
1-deg = 17mm
18
4.6 CONNECTING THE GAS AND WATER
The appliance is supplied with an accessory pack that includes
service valves. The service valves are of the compression type.
The accessory pack contains sealing washers’ etc, for use with
the service valves. When connecting pipe work to the valves,
tighten the compression end rst then insert the sealing wash-
ers before tightening the valve to the appliance.
NOTE
It will be necessary to hold the valve with one spanner whilst
tightening with another.
4.6.1 GAS (g. 26)
The appliance is supplied with a 15mm service valve, connect
a 15mm pipe to the inlet of the valve and tighten both nuts.
NOTE
It will be necessary to calculate the diameter of the gas supply
pipe to ensure the appliance has an adequate supply of gas.
4.6.2 FLOW & RETURN (g. 26)
The appliance is supplied with 22mm service valves for the
ow and return connections, connect a 22mm pipe to the inlet
of each valve and tighten both nuts.
NOTE
Depending on system requirements, it may necessary to in-
crease the size of the ow & return pipe work after the service
valve connections.
4.6.3 COLD WATER INLET (g. 26)
The appliance is supplied with a 15mm combined stopcock
and double check-valve, connect a 15mm pipe to the inlet of
the stopcock and tighten both nuts.
4.6.4 HOT WATER OUTLET (g. 26)
The appliance is supplied with a 15mm outlet connection, con-
nect a 15mm pipe to the outlet connection and tighten both nuts.
4.6.5 SAFETY VALVE (g. 26)
Connect the safety valve connection pipe to the safety valve
outlet and tighten. The discharge pipe must have a continuous fall
away from the appliance to outside and allow any water to drain
away thereby eliminating the possibility of freezing.
The discharge pipe must terminate in a position where any water
- possibly boiling - discharges safely without causing damage or
injury, but is still visible.
4.6.6 CONDENSE PIPE
During normal operation the boiler produces condense which
is collected in a trap located in the lower part of the boiler. A
exible pipe (condense outlet pipe) is connected to the outlet
of the trap. The exible pipe must be connected to a plastic
waste pipe only. The plastic waste pipe must have a minimum
of a 3º fall towards the drain. Any external run of pipe should
be insulated to prevent the risk of freezing.
4.6.7 CONNECTING THE CONDENSATE OUTLET
Gently pull the condense outlet pipe down from its location
inside the boiler until approximately 100mm protrudes from the
underside of the boiler, care should be taken to ensure that the
pipe connection to the trap remains secure. Connect a suitable
plastic (not copper) pipe (no less than 21mm diameter) to the
outlet pipe and ensure it discharges in accordance with local
building regulations or other rules in force.
4.7 ELECTRICAL CONNECTIONS
The boiler is supplied with a 2-metre y-lead. This lead can
be used for connection to the electrical supply. Connect the
y-lead to a fused plug or fused isolator in the following way:
• brown wire to LIVE supply
• blue wire to NEUTRAL supply
• green/yellow to EARTH connection.
Insert the supplied 3-AMP fuse into the fused isolator or fused plug.
Should the y-lead be unsuitable, refer to 4.7.3 for details on
how to connect the electrical supply directly to the boiler.
The electrical supply must be as specied in section 3/3A.
A qualied electrician should connect the appliance to the
electrical supply. If controls - external to the appliance - are
required, a competent person must undertake the design of
any external electrical circuits, please refer to section 8 for
detailed instructions. ANY EXTERNAL CONTROL OR WIRING
MUST BE SERVED FROM THE SAME ISOLATOR AS THAT
OF THE APPLIANCE. The supply cable from the isolator to the
appliance must be 3-core exible sized 0.75mm to BS 6500 or
equivalent. Wiring to the appliance must be rated for operation
in contact with surfaces up to 90 ºC.
Fig. 26
4.7.1 CASING REMOVAL (g. 27)
To gain internal access to the appliance you must rst remove
the casing, proceed as outlined below:
• locate and unscrew the 3-screws (A) that secure the outer
casing to the appliance lift the casing upward to disengage
it from the top locating hooks and then remove
• store the casing and screws safely until required. Ret in
the reverse order.
4.7.2 APPLIANCE TERMINAL BLOCK
The appliance terminal block is located on the rear of the con-
trol fascia. Remove the casing as described in 4.7.1. Gently
pull the control panel forwards and down. Locate the terminal
block cover (g. 28).
NOTE
The appliance comes with a factory tted link (‘TA’) to allow
basic operation of the boiler via the mode selector switch.
If it is anticipated that external controls will be required
please refer to the wiring diagrams in section 8 for more
detailed information.
4.7.3 CONNECTING THE MAINS (230V) INPUT
Unhook and remove the terminal block cover (230V). Pass the
cable through the cable anchorage point. Connect the supply
cable wires (LIVE, NEUTRAL, & EARTH) to their corresponding
terminals (L, N, & E) on the appliance – high voltage – terminal
block. When connecting the EARTH wire, ensure that it’s left
slightly longer that the others, this will prevent strain on the
EARTH wire should the cable become taut. Do not remove the
link wire unless additional external controls are to be tted (see
section 8). The securing screw on the cable anchorage should
now be tightened. This must be done before the terminal block
cover is re-tted in its position.
NOTE
It is the installer’s responsibility to ensure that the appliance is
properly Earthed. Vokèra Ltd. cannot be held responsible for
any damages or injuries caused as a result of incorrect Earth
wiring.
Fig. 27
A
Fig. 28
Hot water outlet
Cold water inlet
stopcock
Gas
cock
C/H ow
valve
C/H return
valve
Safety valve outlet
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VOKERA UNICA i28 Operating instructions
- Category
- Water heaters & boilers
- Type
- Operating instructions
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